www.studybass.com is a very good all around bass site. Start on the first screen - don't skip around, start on the first screen and speed read each page till you have to slow down.
If you want just basic generic music theory ....
http://www.ibreathemusic.com/forums/...ad.php?t=11975
Best thing this site has going for it - is it gives you
basic music theory in six steps. Each step building upon the last step.
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Good luck and have fun.